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[ aws . ecr ]



Starts a preview of the specified lifecycle policy. This allows you to see the results before creating the lifecycle policy.

See also: AWS API Documentation

See 'aws help' for descriptions of global parameters.


[--registry-id <value>]
--repository-name <value>
[--lifecycle-policy-text <value>]
[--cli-input-json <value>]
[--generate-cli-skeleton <value>]


--registry-id (string)

The AWS account ID associated with the registry that contains the repository. If you do not specify a registry, the default registry is assumed.

--repository-name (string)

The name of the repository to be evaluated.

--lifecycle-policy-text (string)

The policy to be evaluated against. If you do not specify a policy, the current policy for the repository is used.

--cli-input-json (string) Performs service operation based on the JSON string provided. The JSON string follows the format provided by --generate-cli-skeleton. If other arguments are provided on the command line, the CLI values will override the JSON-provided values. It is not possible to pass arbitrary binary values using a JSON-provided value as the string will be taken literally.

--generate-cli-skeleton (string) Prints a JSON skeleton to standard output without sending an API request. If provided with no value or the value input, prints a sample input JSON that can be used as an argument for --cli-input-json. If provided with the value output, it validates the command inputs and returns a sample output JSON for that command.

See 'aws help' for descriptions of global parameters.


To create a lifecycle policy preview

This example creates a lifecycle policy preview defined by policy.json` for a repository called ``project-a/amazon-ecs-sample in the default registry for an account.


aws ecr start-lifecycle-policy-preview --repository-name "project-a/amazon-ecs-sample" --lifecycle-policy-text "file://policy.json"

JSON file format:

    "rules": [
            "rulePriority": 1,
            "description": "Expire images older than 14 days",
            "selection": {
                "tagStatus": "untagged",
                "countType": "sinceImagePushed",
                "countUnit": "days",
                "countNumber": 14
            "action": {
                "type": "expire"


     "registryId": "<aws_account_id>",
     "repositoryName": "project-a/amazon-ecs-sample",
     "lifecyclePolicyText": "{\n    \"rules\": [\n        {\n            \"rulePriority\": 1,\n            \"description\": \"Expire images older than 14 days\",\n            \"selection\": {\n                \"tagStatus\": \"untagged\",\n                \"countType\": \"sinceImagePushed\",\n                \"countUnit\": \"days\",\n                \"countNumber\": 14\n            },\n            \"action\": {\n                \"type\": \"expire\"\n            }\n        }\n    ]\n}\n",
     "status": "IN_PROGRESS"


registryId -> (string)

The registry ID associated with the request.

repositoryName -> (string)

The repository name associated with the request.

lifecyclePolicyText -> (string)

The JSON repository policy text.

status -> (string)

The status of the lifecycle policy preview request.